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Overview of Direct Connection Operations
Section 5-1
S Available allocation words
The PT status notify area (PT to PC) can be allocated to the following PC areas.
Symbol C Series PCs Allocated CVM1/CV Series PCs Allocated
DM Data Memory f Data Memory f
CH Internal/Special Relay f Internal/Special Relay f
TIM Timer Timer
CNT Counter Counter
HR Holding Relay f –
AR Auxiliary Relay f Auxiliary Relay
LR Link Relay f –
f: OK : NG
Since the special auxiliary relays of the CV series PCs are allocated to the system,
they cannot be used for purposes other than the system use.
The range of respective area varies with the type of PC. Refer to Appendix L PC
Memory Map (page 278).
Procedure 1. Use the support tool to allocate the PT status notify area (PT to PC) to the PC
memory.
2. Create a PC program to read the “currently displayed screen word” in the in the
PT status notify area when the “screen switch strobe flag” in the PT status
notify area has turned ON.
Reference: The contents of the “currently displayed screen word” are updated also by switch-
ing the screen by pressing a touch switch on the NT20S.
For this function (standalone function or screen switch function), refer to the “Stan-
dalone Function” (page 138).
S Continuous screens and overlapping screens
When a continuous or overlapping screen is displayed, the number of the parent
screen is written to the “currently displayed screen word”.
For the continuous and overlapping screens, refer to the “Classification of
Screens” (page 122).
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